It's a whole motor I bought on eBay for 500 bucks.
I was looking for a K bottom end (kicker only) so I could dump the battery+starter and shave off about 10 pounds off the bike.
The seller didn't know much about the internals, but all I need is the bottom end that will most likely get a stroker crank. The motor came from Yoshimura's warehouse.
If I get lucky, it will be a good running 450 with Yosh cams, better valves and a ported head.
Worst case, I'll get my bottom end and bunch of spare parts I can sell and have what I needed pretty much for free.
Just the stupid kick start kit costs $200... I'm just excited waiting for it to get here so I can open it and see what's hiding inside.